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Old 28th April 2004, 08:47 PM   #1
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Default Converting a Passive Subwoofer to Active

Hi,

I've searched the net for information but haven't been able to find any (perhaps i am using the wrong keywords). I've tried using a 40Watt power amplifier (http://www.kemo-electronic.com/en/module/m034/index.htm) to no avail, nothing seems to be happening. If anyone can tell how I can make this all happen, I'd appreciate it.
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Old 28th April 2004, 10:49 PM   #2
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You need to provide more details...what is your passive sub, what does it look like, how is it wired up, etc.

How did you wire the 40W amp up? If you got absolutely no sound of any kind from the sub, then the amp could not possibly have been wired up properly unless the amp is defective.

EDIT: I noticed that the amp does not specify where to ground the input signal, and it only has 500mV sensitivity, so how you wired it up is even more important.
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Old 30th April 2004, 09:09 AM   #3
sreten is offline sreten  United Kingdom
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The module appears to be suitable for in-car use.

I suspect you are doing something fundamentally wrong.

sreten.
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Old 30th April 2004, 03:37 PM   #4
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I notice that the photo of the unit in the pdf data sheet linkable from the web site and the photo of the unit on the web site itself are different in that the + and - power inputs are swaped in position. The question arises as to where to connect the signal ground.
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Old 15th April 2007, 05:49 PM   #5
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Default did this get sorted?

Have the same problem with this unit, did it get sorted?
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Old 16th April 2007, 07:29 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

- is ground, + is =ve voltage, in = input voltage.

The output must be bridged, so neither should be earthed.

/sreten.
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